RFA PR regression/49498

[Jeff Law]

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As detailed in the PR, improvements to jump threading caused the
relatively simple guard predicates in this testcase to become
significantly more complex.  The predicate complexity is enough to
confuse the predicate-aware pruning of bogus uninitialized variable
warnings.

Note the actual runtime flow control was improved by jump threading,
which was doing exactly what it should.

Based on David's comments, it's unlikely the predicate-aware code in
tree-ssa-uninit.c is going to be able to handle the more complex guards.
 So I'm turning off DOM (jump threading) for this testcase.

OK for trunk?


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